oj.uz

답안 #447370

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
447370 2021-07-26T07:50:20 Z Khizri Sure Bet (CEOI17_sure) C++17
0 / 100
 1 ms 332 KB 
#include <bits/stdc++.h>
using namespace std;
//------------------------------DEFINE------------------------------
//******************************************************************
#define IOS ios_base::sync_with_stdio(false); cin.tie(0),cout.tie(0)
#define ll long long
#define pb push_back		 
#define F first																 
#define S second 															 
#define INF 1e18
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pii pair<int,int>
#define pll pair<ll,ll>
#define OK cout<<"Ok"<<endl;
#define MOD (ll)(1e9+7)
#define endl "\n"
//******************************************************************
//----------------------------FUNCTION------------------------------
//******************************************************************
ll gcd(ll a,ll b){
	if(a>b) swap(a,b);
	if(a==0) return a+b;
	return gcd(b%a,a);
}
ll lcm(ll a,ll b){
	return a/gcd(a,b)*b;
}
bool is_prime(ll n){
	ll k=sqrt(n);
	if(n==2) return true;
	if(n<2||n%2==0||k*k==n) return false;
	for(int i=3;i<=k;i+=2){
		if(n%i==0){
			return false;
		}
	}
	return true;
}
//*****************************************************************
//--------------------------MAIN-CODE------------------------------
const int mxn=2e5+5;
int t=1,n;
double a[mxn],b[mxn],m;
vector<pair<double,pair<double,double>>>vt;
void solve(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i]>>b[i];
		vt.pb({{a[i]-b[i]},{a[i],b[i]}});
	}
	double ans=0;
	double x=0,y=0,k=0;
	int l=0,r=n-1;
	sort(rall(vt));
	while(l<=r){
		if(x==y){
			if(vt[l].F>-vt[r].F){
				x+=vt[l].S.F;
				k+=1;
				l++;
			}
			else{
				y+=vt[r].S.S;
				k+=1;
				r--;
			}
		}
		else if(x<y){
			x+=vt[l].S.F;
			k+=1;
			l++;
		}
		else{
			y+=vt[r].S.S;
			k+=1;
			r--;
		}
		//cout<<x<<' '<<y<<' '<<k<<endl;
		ans=max(ans,min((double)(x-k),(double)(y-k)));
	}
	printf("%.4lf",(double)ans);
}
int main(){
	IOS;
	//cin>>t;
	while(t--){
		solve();
	}
	return 0;
}

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 332 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -